If you want the uncensored version here is a temporary fix thanks to ShaneTim
The process can be seen here.

The (overly)censored version of L4D2 is set to be released in Australia this version removes key features in the game not allowing the Australian Community to access the full game more like half of it.

This version of L4D2 came about due to the RC(refused classification) of the original uncut version to the OFLC due to there being no R18+ rating one side to the problem.

The Content

So you may think the only content removed was the visual content you are WRONG!

Now for something that CHANGES GAMEPLAY:
Uncommon Infected(UCI) the Riot Cop i.e Bulletproof Zombie completely removed.
[Moderator edit: Only the Riot Cop UCI is removed. All other UCI (clown, hazmat, etc) are still in the game.]

Thankums for clearing that up, Mod ^-^

If Someone with an uncut version joins a game with Australians with the cut version Uncommon Infected will NOT spawn

Now lets see what conflicts here:

Visual effects:
Bodies Disappear: Now this DID NOT happen in Left 4 Dead 1 and it gained the MA15+ Rating why the hell was this removed? and why are prop corpses present if corpses disappear
Gore and Blood: This has been drastically tuned down compared to Left 4 Dead 1(MA15+) and even removed decapitation which was present in Left 4 Dead 1.

Gameplay:
UCI's(UnCommon Infected) were removed which is a new key gameplay mechanic which allows L4D2 to be just that more Different to L4D1 The Riot Cop will not Spawn on Australian Cut versions why is this? Shooting Cops is not allowed? Lets see what games do this that are classified:
CS 1.6
CSS
Prototype
Resident Evils
GTA Series
Give me a valid reason the Riot Cop was removed ALSO the fact they were Security and not the law enforcement conflicts the reason for removal.

Another issue Qouted from Voight
Have you played online much?

Because now if people find out you have the Australian version they'll kick you straight away.

It's a sad fact.
I've seen this happen 4 times, the riot cop wont spawn and people get suspicious, and if someone admits they have the Australian version, its an INSTANT vote kick.

How to possibly get this fixed:
KEEP THIS THREAD ON FRONT PAGE!
Wait for a patch? Be warned using a patch not made by valve my result in a ban.
Spam(but be civil) the South Australian Attorney-General Michael Atkinson who is blocking R18+ ratings His Details:

Call of Duty MW2 has been passed classification even after a surfacing of the video in which the player must slaughter unarmed civilian innocents in cold blood to perform a terrorist attack HOW can this be allowed and not the slaughter of crazed Zombies?

It's like going several steps back in FPS history. Even Wolfenstein 3D has more blood and at least the corpses in that game stick around so you remember where the ♥♥♥♥ you have been and not trail backwards.

It's actually kind of frustrating because now I'm not even sure if I've killed an infected because they show no signs of damage and just spazz out for awhile and do their thing, either getting back up or collapsing and evaporating.

Just played it myself, this is ♥♥♥♥ing pathetic. Bodies are faded away before they hit the ground, hardly any blood at all. It's a ♥♥♥♥ing step backwards from L4D1. I will spend every minute from now till the day the full game is out figuring out how to get our violence back, because it's really ruining the game experience for me